Secure extracts

Updated extract calls to use EXTR_SKIP.

laravel/database/grammars/grammar.php

@@ -89,7 +89,7 @@ protected function joins(Query $query)
 
 		foreach ($query->joins as $join)
 		{
-			extract($join);
+			extract($join, EXTR_SKIP);
 
 			list($column1, $column2) = array($this->wrap($column1), $this->wrap($column2));
 

laravel/session/drivers/cookie.php

@@ -61,7 +61,7 @@ public function load($id)
 	 */
 	public function save($session, $config, $exists)
 	{
-		extract($config);
+		extract($config, EXTR_SKIP);
 
 		$payload = $this->crypter->encrypt(serialize($session));